CN1299150C - Display and control method thereof - Google Patents

Display and control method thereof Download PDF

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Publication number
CN1299150C
CN1299150C CNB011331755A CN01133175A CN1299150C CN 1299150 C CN1299150 C CN 1299150C CN B011331755 A CNB011331755 A CN B011331755A CN 01133175 A CN01133175 A CN 01133175A CN 1299150 C CN1299150 C CN 1299150C
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mentioned
signal
circuit
display
display device
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CN1345024A (en
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筒井雄介
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0857—Static memory circuit, e.g. flip-flop
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving

Abstract

There is provided a display device which enables both a full color moving image display (analog mode) and a shallow depth still image display (digital mode), and which achieves a significant reduction in the energy consumption of the display device system including the external LSI. Each of the pixel elements of the display device has two different display circuits corresponding to the respective display modes and a switching circuit for selecting one of them. When the digital mode is selected, the supply of the voltage power to the circuits not required to operate (a DA converter, a operational amplifier and a timing controller) under the mode is halted for reducing the consumption of the electric power by the display device.

Description

Display device and control method thereof
Technical field
The present invention relates to display device, particularly relate to the display device of using in the display device that is suitable for to carry.
Background technology
In recent years, the display device that demand can be carried on the market, for example portable type TV, mobile phone etc.According to such requirement, the development research of the miniaturization corresponding to display device just in vogue, lightweight, low-power consumption.
Fig. 6 represents the circuit structure diagram of a display pixel of the liquid crystal indicator of conventional example.Be provided with TFT70 on insulativity substrate (not shown), this TFT70 forms at signal line 51 and drain signal line 61 cross parts, and is being connected near this cross part on two signal line 51,61.The source electrode 11s of TFT65 is connected on the show electrode 80 of liquid crystal 21.
In addition, be provided with auxiliary capacitor 85, be used for keeping at a field interval voltage of show electrode 80, an end 86 of this auxiliary capacitor 85 is connected on the source electrode 11s of TFT65, and the public current potential of each display pixel is added on another electrode 87.Here, if sweep signal is added on the signal line 51, then TFT65 is conducting state, and analog video signal is delivered to show electrode 80 from drain signal line 61, remains on simultaneously in the auxiliary capacitor 85.The video voltage that is added on the show electrode 80 is added on the liquid crystal 21, and liquid crystal 21 is orientated according to this voltage, can obtain liquid crystal display thus.Therefore, energy acquisition and dynamic image, the irrelevant demonstration of rest image.When showing rest image on such liquid crystal indicator, the surplus that for example drives the battery that mobile phone uses on the part of the liquid crystal display part of mobile phone shows, shows the image of dry cell.
, the same during also with the demonstration dynamic image under the situation that shows rest image in the liquid crystal indicator of said structure, need make TFT65 be conducting state with sweep signal, vision signal is write in each display pixel once more.Therefore, since the outside LSI that the various signals that the driving circuit that drive signals such as sweep signal and vision signal use and the work schedule that control Driver Circuit takes place use take place always in work, so usually consume high-power.Therefore, in only having power-limited mobile phone etc., there is the shortcoming that the time that can use lacks.
Different therewith, open in flat 8-194205 number the spy and to disclose the liquid crystal indicator that in each display pixel, has the static type storer.A part of quoting this communique below describes, as shown in Figure 7, this liquid crystal indicator is the storer that will two-stage phase inverter INV1, INV2 be carried out the positive feedback type, is the holding circuit usefulness of static type storer as digital video signal, so as to reducing consumed power.Here, on-off element 24 is controlled the resistance value between line of reference Vref and the show electrode 80 according to the diadic digital video signal that keeps in the static type storer, adjusts the bias state of liquid crystal 21.On the other hand, with AC signal Vcom input common electrode.If this device makes display image change as rest image in the ideal case, storer is refreshed with regard to not needing.
As mentioned above, in existing liquid crystal indicator, be suitable for the panchromatic dynamic image of corresponding demonstration with analog video signal.On the other hand, in having the liquid crystal indicator that keeps the static type storer that digital video signal uses, be suitable for the low rest image of display gray scale grade, reduced power consumption simultaneously.
, because two kinds of liquid crystal indicators adopt different video signal sources, so can not realize simultaneously that in a display device panchromatic dynamic image shows and still image shows.In addition, carrying out with the liquid crystal indicator that has a static type storer under the situation that rest image shows, do not carrying out various control signals are exported to the trial of low power consumption of the outside LSI of liquid crystal indicator.
Summary of the invention
The present invention can show such two kinds of demonstrations corresponding to the rest image that carries out panchromatic dynamic image demonstration and low-power consumption with a display device (for example a slice display panels).In addition, the present invention seeks to reduce significantly the power consumption of the whole display systems that comprise external outside LSI in the display device.Main contents among the application in the invention disclosed are described as follows.
That is, display device of the present invention has: along many signal lines of a direction configuration on the substrate; Sweep signal is supplied with successively the gate drivers of above-mentioned signal line;
Many drain signal line along the direction configuration that intersects with above-mentioned gate line;
Select above-mentioned drain signal line successively, vision signal is supplied with the drain driver of this drain signal line;
Timing control signal is supplied with the sequential control circuit of above-mentioned gate drivers or drain driver; And
Be configured to rectangular, by select from the sweep signal of above-mentioned signal line, have from the display device of the show electrode of above-mentioned drain signal line supplying video signal and comprise simultaneously:
The vision signal that be configured on every above-mentioned show electrode, will import is one by one supplied with first display circuit of above-mentioned show electrode one by one;
Corresponding to the configuration of above-mentioned show electrode, have a holding circuit that keeps vision signal, will the voltage corresponding supply with second display circuit of above-mentioned show electrode with the signal that this holding circuit keeps;
Select the circuit of above-mentioned first and second display circuit to select circuit; And
When having selected above-mentioned second display circuit, stop the control circuit that stops to the allocated circuit supply line voltage that does not need work.
When having selected second display circuit, owing to show according to the signal that keeps in the holding circuit, different with the situation of having selected first display circuit, appearance does not need the circuit of work.Therefore, by not needing stopping the allocated circuit supply line voltage of work, can reduce power consumption significantly to these.
In addition, about stopping to which type of circuit supply line voltage, preferred embodiment is as follows.
That is, in said structure, also have the DA translation circuit that input digital video signal is transformed into analog video signal, when having selected above-mentioned second display circuit, stop to above-mentioned DA translation circuit supply line voltage.Because the DA translation circuit has big power consumption, so the reduction effect of power is big.
In addition, except above-mentioned structure, also have the amplifying circuit that amplifies analog video signal, when having selected above-mentioned second display circuit, stop to above-mentioned amplifying circuit supply line voltage.Because amplifying circuit also has bigger power consumption, so the reduction effect of power is big.
In addition, in said structure, when having selected above-mentioned second display circuit, stop to above-mentioned gate drivers or drain driver supply line voltage.Because gate drivers, drain driver also have bigger power consumption, so the reduction effect of power is big.
In addition, when having selected above-mentioned second display circuit, stop to gate drivers and drain driver supply line voltage.
In addition, except above-mentioned structure, the first AC driving signal of the opposite electrode of the liquid crystal of the above-mentioned display panel of above-mentioned sequential control circuit generation supply also has: the oscillator that the second AC driving signal of this first AC driving Chief Signal Boatswain of its period ratio takes place; And when having selected above-mentioned second display circuit, switch to the commutation circuit of the above-mentioned second AC driving signal from the above-mentioned first AC driving signal.
In order to prevent that liquid crystal from degenerating, the AC driving signal need be supplied with opposite electrode, but when digital display mode since the flicker of display panel be out of question, so compare during with the simulation display mode, even macrocyclic AC driving signal also is sufficient.
Therefore,, switch above-mentioned first and second AC driving signal, the power consumption in the time of reducing digital display mode according to above-mentioned mode switching signal.Here, with regard to the low-power consumption this point, the cycle of the second AC driving signal preferably greater than one vertical during.
In addition, in said structure, when having selected above-mentioned second display circuit, stop to above-mentioned sequential control circuit supply line voltage.Have the oscillator that the second AC driving signal takes place owing to be independent of sequential control circuit, so even stop to the sequential control circuit supply line voltage also no problem.Therefore, the power consumption in the time of more reducing digital display mode.
Description of drawings
Fig. 1 is the circuit structure diagram of the liquid crystal indicator of embodiments of the invention.
Fig. 2 is the circuit structure diagram of commutation circuit of the vision signal of embodiments of the invention.
Fig. 3 is another circuit structure diagram of the liquid crystal indicator of embodiments of the invention.
Fig. 4 is the sequential chart of the liquid crystal indicator of embodiments of the invention.
Fig. 5 is the sectional view of reflection-type liquid-crystal display device.
Fig. 6 is the circuit structure diagram of the liquid crystal indicator of conventional example.
Fig. 7 is another circuit structure diagram of the liquid crystal indicator of conventional example.
Embodiment
Secondly, the display device of embodiments of the invention is described.Illustrated among Fig. 1 the circuit structure diagram of display device applications of the present invention when the liquid crystal indicator.
The 301st, the delay trigger circuit (DFF:DelayedFlip Flop) that constitute by trigger circuit 302,303.Be high level if import the display mode switching signal DH of elementary trigger circuit 302, then trigger circuit 302 with from the vertical cycle end signal Vend of time schedule controller 305 output mode switching signal MD synchronously.
In addition, trigger circuit 303 are synchronously exported stop control signal LA with the next vertical cycle end signal Vend that arrives.The work of described each circuit in mode switching signal MD, stop control signal LA control back.
Time schedule controller 305 is according to system clock CLK, horizontal-drive signal Hsync, vertical synchronizing signal Vsync, output slab control signal PC, vertical during end signal Vend, the opposite electrode that is housed in the liquid crystal in the display panel 100 is carried out the AC driving signal FRP that inversion driving uses and the work clock DACCLK of DA converter 310.Here, comprise the horizontal starting impulse STH of the trigger pip that becomes the panel sweep signal, vertical starting impulse STV among the above-mentioned panel control signals PC.
Make the quit work signal of usefulness of time schedule controller 305 with door 306 output.Above-mentioned stop control signal LA and display mode switching signal DH be transfused to this with door in.Therefore, time schedule controller 305 when two signals are high level, quit work (during digital display mode).In addition, when display mode switching signal DH became low level, halted state was disengaged, and can turn back to the simulation display mode.
In addition, with time schedule controller 305 oscillator 307 is set independently.The long AC driving signal of signal period (being generally a horizontal cycle) of the AC driving signal FRP of its period ratio time schedule controller 305 outputs takes place in the signal source of the AC driving signal when oscillator 307 becomes digital display mode.
Here, as hereinafter described, when digital display mode, adopt such structure, that is, and by the holding circuit maintenance digital video signal of static state, simultaneously according to this holding signal, selection is added in the signal on the show electrode, thus the decay of the vision signal that the electric leakage because of auxiliary capacitor causes can not take place as simulation is during display mode, therefore just enough with the lower AC driving signal of frequency.And this signal period is more than the vertical cycle (being equivalent to 60Hz), is suitable for low power consumption.
According to mode switching signal MD, the AC driving signal FRP by commutation circuit SW3 switches the output and time schedule controller 305 outputs of oscillator 307 after operational amplifier 308 amplifies, is imported among the opposite electrode terminal COM.In addition, the output signal of oscillator 307 is anti-phase with phase place by phase inverter 309, is input among the signal terminal LSIG after being amplified by operational amplifier 315 again.As hereinafter described, the opposite signal of these two phase places is used to show " in vain " or " deceiving " in digital display mode.
DA converter 310 will convert analog video signal to from R, G, the B digital video signal data of outside input.Here, R, G, each digital video signal data of B constitute by 8 usually.The video signal data of its most significant digit and the analog video signal that is amplified by operational amplifier 311 again after the DA conversion are imported into commutation circuit SW1.Then by commutation circuit SW1 according to mode switching signal MD, switch this two signals, export to R, G, the B terminal of display panel 100.
In addition, in the present embodiment, the holding circuit that the maintenance digital video signal data in the described display panel 100 in back is used constitutes by 1, so only export most significant digit, if but holding circuit were constituted multidigit, then could be altered to the structure of the digital video signal of the output multidigit corresponding with it.
In addition, commutation circuit SW2 is according to mode switching signal MD, high level or low level exported to the terminal LVDD of display panel 100.Corresponding, as hereinafter described, display panel 100 is switched into simulation display mode (LVDD=low level), digital display mode (LVDD=high level).
In addition, power circuit 320 constitutes like this: according to power supply input, generate supply voltage VDD1, VDD2 (for example 5V), VCC1, VCC2 (for example 8～10V), VEE1, VEE2 (for example-4～-5V).On each power supply output line 321,322,323 of power circuit 320, be provided with commutation circuit SW4, SW5, SW6, carry out break-make with output door 306, can control to allocated circuit and supply with VDD1, VCC1, VEE1 according to above-mentioned.
Here, if be high level with the output of door 306, then commutation circuit SW4, SW5, SW6 conducting, stop to supply line voltage VDD1, VCC1, VEE1 circuit, be the inner drive power supply of DA converter 310, operational amplifier 311, time schedule controller 305, display panel 100.
Secondly, the sequential chart with reference to shown in Figure 2 illustrates the work of the display device of said structure.If display mode switching signal DH is switched into high level, then mode switching signal MD synchronously rises with the rising of the vertical cycle end signal Vend of the moment generation that finishes at vertical cycle, and mode switching signal MD rises to high level.
So, utilize commutation circuit SW2 terminal LVDD to rise to high level, display panel 100 is switched into digital display mode.Commutation circuit SW1 is switched simultaneously, and the digital video signal data of most significant digit is exported to R, G, B terminal.In addition, AC driving signal (being imported into the signal of opposite electrode terminal COM) switches to low frequency by commutation circuit SW3.So, spend a vertical cycle (rise to next Vend till cycle), digital video signal data is written among of display panel 100.
Finish if write vertical cycle of usefulness, next vertical cycle end signal Vend arrives, and then stop control signal LA and its synchronously rise.So, rise to high level with the output of door 306, in view of the above, the work of time schedule controller 305 stops.That is, various panel control signals PC, be fixed for the output signals such as work clock DACCLK of DA converter 310.Therefore, the work of DA converter 310 also stops.
In addition, along with the output with door 306 rises to high level, commutation circuit SW4, SW5, SW6 are switched on, and stop the inner drive power supply to DA converter 310, operational amplifier 311, time schedule controller 305, display panel 100.
Like this,, then in digital display mode, unwanted circuit is quit work, and stop supply line voltage,, can reduce power consumption significantly so can there not be the static current sinking of circuit if adopt the present invention.Its effect only is about 1/5 when work is stopped.
Secondly, under the situation that turns back to the simulation display mode, display mode switching signal DH is switched to low level.So, be low level with the output of door 306, so time schedule controller 305 is started working once more.In addition, if mode switching signal drops to low level, then commutation circuit SW1 and vertical cycle end signal Vend synchronously switch, so that output is from the analog video signal of DA converter output.Simultaneously, commutation circuit SW2 switches, so that will export to terminal COM from the AC driving signal FRP of time schedule controller 305.In addition, commutation circuit SW3 switches to VEE one side, and display panel 100 is set to common simulation display mode.
In addition, if be low level with the output of door 306, then commutation circuit SW4, SW5, SW6 are turned off, and begin the inner drive power supply to DA converter 310, operational amplifier 311, time schedule controller 305, display panel 100 once more.Thereafter, if next vertical cycle end signal Vend arrives, then stop control signal LA drops to low level.So, display panel 100 just turns back to common simulation display mode.
Secondly, describe the circuit structure of display panel 100 bodies in detail with reference to Fig. 3.Disposing many signal lines 51 that are connected on the gate drivers 50 of supplying with sweep signal in the same direction in insulated substrate 10 upper edges, disposing many drain signal line 61 along the direction of intersecting with these signal lines 51.
Corresponding to the moment of the sampling pulse of exporting from drain driver 60, sampling transistor SP1, SP2 ..., the SPn conducting, the data-signal of data signal line 62 is supplied to drain signal line 61.Here, the data-signal of data signal line 62 is corresponding to the switching of the outside commutation circuit SW1 of above-mentioned display panel 100 and digital video signal or the analog video signal (Fig. 1) supplied with.
Display panels 100 constitutes like this: be configured to rectangular by a plurality of display pixels 200 of selecting from the sweep signal of signal line 51, supply with from the data-signal of drain signal line 61 simultaneously.
Below, the detailed structure of display pixel 200 is described.The circuit that is made of P channel-type TFT41 and N channel-type TFT42 selects circuit 40 to be arranged near the cross part of signal line 51 and drain signal line 61.TFT41, two drain electrodes of 42 are connected on the drain signal line 61, and their two grids are connected to and select on the signal wire 88 simultaneously.The a certain root of TFT41,42 among both is according to from the selection signal of selecting signal wire 88 and conducting.In addition, as hereinafter described, select circuit 40 that circuit is set in couples with circuit and select circuit 43.Here, selection signal wire 88 is the signal wires from the terminal LVDD configuration of display panel 100.
Can select circuit 40,43 to select and the demonstration (corresponding to panchromatic dynamic image) of the described analog video signal in switching back and the demonstration (corresponding to low-power consumption, rest image) of digital picture by circuit.In addition, select circuit 40 to be adjacent to dispose the pixel selection circuit 70 that constitutes by N channel-type TFT71 and N channel-type TFT72 with circuit.TFT71,72 selects the TFT41,42 of circuit 40 to be connected in series with circuit respectively, and signal line 51 is connected on their two grids simultaneously.TFT71,72 is according to from the sweep signal of signal line 51, both conductings simultaneously.
In addition, be provided with the auxiliary capacitor 85 that keeps analog video signal to use.An electrode 86 of auxiliary capacitor 85 is connected on the source electrode 71a of TFT71.Another electrode 87 is connected on the public auxiliary capacitance line 88, supplies with bias voltage Vsc.After the gate turn-on of each TFT of ifs circuit selection circuit 70, analog video signal is added on the liquid crystal 21, though then this signal must maintain at a field interval, As time goes on and gradually this voltage of signals only reduces on liquid crystal 21.If so, will occur showing that the depth is irregular and can not obtain good demonstration.Therefore, for this voltage is maintained at a field interval auxiliary capacitor 85 to be set.
Circuit selects the P channel-type TFT44 of circuit 43 to be arranged between this auxiliary capacitor 85 and the liquid crystal 21, with the TFT41 while break-make of circuit selection circuit 43.
In addition, holding circuit 110, signal selecting circuit 120 are arranged between the show electrode 80 of the TFT72 of pixel selection circuit 70 and liquid crystal 21.Holding circuit 110 is made of two phase inverters of positive feedback, constitutes the static type storer that keeps digital diadic.
In addition, signal selecting circuit 120 is circuit of selecting signal according to the signal that comes self-hold circuit 110, constitutes two N channel-type TFT121,122.Come the output signal of the complementation of self-hold circuit 110 to be added in respectively on TFT121,122 the grid, so TFT121,122 break-make complementally.
Here, if the TFT122 conducting just select AC driving signal (signal B), if the TFT121 conducting just select opposite electrode signal VCOM (signal A), is selected the TFT45 of circuit 43 through oversampling circuit, is supplied with voltage is added on the show electrode 80 on the liquid crystal 21.Here, opposite electrode signal VCOM (signal A) is equivalent to the signal from above-mentioned oscillator 307, and signal B is equivalent to the output of above-mentioned oscillator 307 by anti-phase signal.
Above-mentioned structure can be summarized as follows: be provided with the circuit (first display device) that is made of the auxiliary capacitor that keeps as the TFT71 of pixel selection element and analog video signal and by keeping the TFT72 as the pixel selection element, the holding circuit 110 of digital video signal that keeps diadic and the circuit (second display device) that is made of signal selecting circuit 120 in a display pixel 200, in addition, be provided with the circuit of selecting these two circuit to use and select circuit 40,43.
Secondly, the peripheral circuit of liquid crystal panel 200 is described.Panel driving is arranged on the external circuits substrate 90 of the substrate different with the insulativity substrate 10 of liquid crystal panel 200 with LSI91.Vertical enabling signal STV is input on the gate drivers 50 with LSI91 from the panel driving of this external circuits substrate 90, and horizontal enabling signal STH is imported on the drain driver 60.In addition, vision signal is imported into data line 62.Here, panel driving is equivalent to above-mentioned time schedule controller 305 with LSI91.
Secondly, referring to figs. 1 through Fig. 4, the driving method of the display panel of said structure is described.Fig. 4 is the sequential chart of liquid crystal indicator when having selected digital display mode.
(1) situation of simulation display mode
If selected the simulation display mode according to mode switching signal MD (low level), then set the state that analog video signal is exported to data signal line 62 for by commutation circuit SW1, the current potential of circuit selection signal line 88 is low level simultaneously, and circuit is selected TFT41,44 conductings of circuit 40,43.
In addition, according to sampled signal based on horizontal enabling signal STH, sampling transistor SP conducting, the analog video signal of data signal line 62 is supplied to drain signal line 61.
In addition, based on vertical enabling signal STV, sweep signal is supplied to signal line 51.If according to sweep signal, the TFT71 conducting, then analog video signal Sig passes to show electrode 80 from drain signal line 61, is maintained at simultaneously in the auxiliary capacitor 85.The video voltage that is added on the show electrode 80 is added on the liquid crystal 21, according to this voltage, by to liquid crystal 21 orientations, can obtain liquid crystal display.
In this simulation display mode, because incoming video signal voltage one by one, so be suitable for showing panchromatic dynamic image.But, produce power consumption constantly in order to drive them at the LSI91 of external circuit substrate 90, each driver 50,60.
(2) digital display mode
If selected digital display mode according to mode switching signal MD (high level), then set the state that digital video signal is exported to data signal line 62 for, the current potential of circuit selection signal line 88 is high level simultaneously, but holding circuit 110 is duty.In addition, circuit selects the TFT41,44 of circuit 40,43 to turn-off TFT42,45 conductings simultaneously.
In addition, enabling signal STV, STH are input to gate drivers 50 and the drain driver 60 with LSI91 (time schedule controller 305) from the panel driving of external circuit substrate 90.Corresponding, sampled signal takes place successively, according to sampled signal separately, sampling transistor SP1, SP2 ..., SPn conducting successively, Sig takes a sample to digital video signal, supplies with each drain signal line 61.
Here illustrate that first goes, promptly applies the signal line 51 of sweep signal G1.At first, by means of sweep signal G1, be connected each display pixel P11, P12 on the signal line 51 ... each TFT of P1n is a horizontal scan period conducting.
Note the display pixel P11 of first row, first row, by means of sampled signal SP1, the digital video signal S11 after the sampling is imported into drain signal line 61.Then, if TFT72 is conducting state by means of sweep signal G1, then this drain signal D1 is imported in the holding circuit 110.
The signal that remains in this holding circuit 110 is imported into signal selecting circuit 120, selects signal A or signal B in this signal selecting circuit 120, and the signal of this selection is added on the show electrode 80, and its voltage is added on the liquid crystal 21.
So, scan by signal line 51 from signal line 51 to last column, the end that writes by the scanning of a picture (field interval), the digital signal of promptly being undertaken by whole spot scans demonstrates a picture according to the digital video signal that writes in the holding circuit 110.
Here, if a picture is revealed, as mentioned above, based on stop control signal LA, stop to gate drivers 50 and drain driver 60, external panel driving preventing driving to them with LSI91 unwanted circuit supplies such as (time schedule controllers 305).
Usually voltage VDD, VSS are supplied with holding circuit 110 to drive, in addition,, each signal A and signal B are supplied with selection circuit 120 opposite electrode 32 that low-frequency ac drive signal VCOM (for example 60Hz) supplies with liquid crystal 21.Promptly, be added on the opposite electrode 32 at AC driving signal VCOM, display panels 100 is under the situation of Chang Bai (NW), signal A is applied the AC driving signal VCOM identical with opposite electrode 32, signal B is applied the AC driving signal opposite with signal A phase place.
At this moment, digital video signal is high level and is transfused under the situation in the holding circuit 110 on drain signal line 61, in signal selecting circuit 120, low level is imported among the TFT121, so a TFT121 is turned off, high level is imported among another the 2nd TFT122, so the 2nd TFT122 is switched on.
If do like this, then select signal B, the voltage of the signal B opposite with opposite electrode 32 phase places is added on the show electrode 80 of liquid crystal, and liquid crystal is owing to effect of electric field is erect, so can observe black display when showing on the display panel of Chang Bai.
Digital video signal is low level and is imported under the situation in the holding circuit 110 on drain signal line 61, in signal selecting circuit 120, high level is imported among the TFT121, so TFT121 conducting, low level is transfused among another the 2nd TFT122, so the 2nd TFT122 turn-offs.If do like this, then select signal A, signal A is added on the liquid crystal.That is, owing to apply and the identical signal of opposite electrode 32 phase places, so electric field does not take place, liquid crystal is not erect, and shows so can observe white when showing on the display panel of Chang Bai.
In this numeral display mode, write a picture and it is kept, can show rest image thus, owing to stop the driving of each driver 50,60 and LSI91 etc. and the supply of power supply, so can reduce power consumption significantly.
Display device of the present invention can be advantageously applied in the liquid crystal indicator, particularly in the reflection-type liquid-crystal display device.Therefore, the structure of this reflection-type liquid-crystal display device is described with reference to Fig. 5.
As shown in Figure 5, form gate insulating film 12 on a slice insulativity substrate 10 and on the semiconductor layer that is island 11 that is constituting by polysilicon, forming grid 13 above the semiconductor layer 11, on gate insulating film 12.
On lower floor's semiconductor layer 11 of the both sides that are positioned at grid 13, form source electrode 11s and drain electrode 11d.Interlayer dielectric 14 is deposited on grid 13 and the gate insulating film 12, the position that reaches corresponding to source electrode 11s in the position corresponding to this drain electrode 11d forms contact hole 15, drain electrode 11d is connected in the drain electrode 16 through this contact hole 15, source electrode 11s is connected on the show electrode 19 through being arranged on the contact hole 18 that is provided with on the planarization insulating film 17 on the interlayer dielectric 14.
Each show electrode 19 that forms on planarization insulating film 17 is made of aluminium reflecting materials such as (Al).On each show electrode 19 and planarization insulating film 17, form the alignment films 20 that constitutes by the polyimide that makes liquid crystal 21 orientations etc.
On another sheet insulativity substrate 30, form the opposite electrode 32 be red (R), green (G), blue (B) color filter 31 of all kinds, constitute by ITO (Indium Tin Oxide, the tin indium oxide) nesa coating of etc.ing and the alignment films 33 that liquid crystal 21 is orientated successively.Do not carrying out not needing color filter 31 under the colored situation about showing.
Utilize the perimeter bond of a pair of insulativity substrate 10,30 that the cohesiveness encapsulant will form like this, liquid crystal 21 is filled in the space that forms thus, make reflection-type liquid-crystal display device.
Shown in dotted arrow among the figure, from the exterior light of observer's 1 one side incidents from opposite electrode substrate 30 incident successively, be shown electrode 19 reflections after, from observer's 1 one side outgoing, observer 1 can observe demonstration.
Like this, reflection-type liquid-crystal display device is to make the mode of external light reflection observe to show, need not as transmissive liquid crystal display device, use in a side opposite with the observer so-called backlight, so the electric power that this backlight lightening is used.Therefore, as display device of the present invention, be a kind of be applicable to need not be backlight, low in energy consumption reflection-type liquid-crystal display device.
In the above-described embodiment, provided during whole spot scans of a picture, apply the voltage condition of opposed electrode voltage and signal A and B, but the present invention has been not limited to this, also can not apply these voltage during this period., be advisable not apply these voltages in order to reduce power consumption.
In addition, in the above-described embodiment, although understand in digital display mode the situation of the digital data signal of 1 of input, but the present invention is not limited to this, even also can use under the situation of the digital data signal of multidigit.By doing like this, can carry out the demonstration of many gray scales.At this moment, be necessary to make the figure place of the number of holding circuit and signal selecting circuit corresponding to input.
In addition, in the above-described embodiment, although understand rest image is presented at situation on the part of display panels, but the application is not limited to this, also rest image can be presented on whole display pixels, and this is the distinctive effect of the present application.
In the above-described embodiment, although understand the situation of reflection-type liquid-crystal display device, but the zone in a pixel except TFT, holding circuit, signal selecting circuit and signal routing by the configuration transparency electrode, also can be used for transmissive liquid crystal display device.
If adopt display device of the present invention, then can select the panchromatic dynamic image of simulation display mode to show, and the few rest image of the number of greyscale levels corresponding to low-power consumption of digital display mode show such two kinds of demonstrations with a display panel.
Particularly under the situation of having selected digital display mode, owing to not only stopped the work of unwanted circuit, and stopped power supply, so can reduce the power consumption of display device integral body significantly.
Therefore, under the situation that display device of the present invention is used to use power-limited portable type TV such as battery, mobile phone, because power consumption is few, so can show for a long time.

Claims (15)

1. display device has:
Many signal lines along a direction configuration on the substrate;
Sweep signal is supplied with successively the gate drivers of above-mentioned signal line;
Many drain signal line along the direction configuration that intersects with above-mentioned gate line;
Select above-mentioned drain signal line successively, vision signal is supplied with the drain driver of this drain signal line;
Timing control signal is supplied with the sequential control circuit of above-mentioned gate drivers or drain driver; And
Be configured to rectangular, by select from the sweep signal of above-mentioned signal line, simultaneously from the show electrode of above-mentioned drain signal line supplying video signal, it is characterized in that, have:
The vision signal that be configured on every above-mentioned show electrode, will import is one by one supplied with first display circuit of above-mentioned show electrode one by one;
Corresponding to the configuration of above-mentioned show electrode, have a holding circuit that keeps vision signal, will the voltage corresponding supply with second display circuit of above-mentioned show electrode with the signal that this holding circuit keeps;
Select the circuit of above-mentioned first and second display circuit to select circuit; And
When having selected above-mentioned second display circuit, stop the control circuit that stops to the allocated circuit supply line voltage that does not need work.
2. display device as claimed in claim 1 is characterized in that, the above-mentioned control circuit that stops to comprise: postpone to produce the delay trigger circuit of stop control signal from the display mode switching signal of outside input based on the vertical cycle end signal; And the gate circuit that has applied this stop control signal and above-mentioned display mode switching signal, according to the output of this gate circuit, stop to the allocated circuit supply line voltage that does not need work.
3. display device as claimed in claim 1 or 2 is characterized in that, also has the DA change-over circuit that input digital video signal is converted to analog video signal; When having selected above-mentioned second display circuit, the above-mentioned control circuit that stops to stop to provide supply voltage to above-mentioned DA change-over circuit.
4. display device as claimed in claim 1 or 2 is characterized in that, also has the amplifying circuit that amplifies analog video signal, and when having selected above-mentioned second display circuit, the above-mentioned control circuit that stops to stop to above-mentioned amplifying circuit supply line voltage.
5. display device as claimed in claim 1 is characterized in that, when having selected above-mentioned second display circuit, the above-mentioned control circuit that stops to stop to above-mentioned gate drivers or drain driver supply line voltage.
6. display device as claimed in claim 1 or 2 is characterized in that, the first AC driving signal of the opposite electrode of the liquid crystal of the above-mentioned display panel of above-mentioned sequential control circuit generation supply,
Also have the oscillator of the second AC driving signal that this first AC driving Chief Signal Boatswain of its period ratio takes place simultaneously; And
When having selected above-mentioned second display circuit, switch to the commutation circuit of the above-mentioned second AC driving signal from the above-mentioned first AC driving signal.
7. display device as claimed in claim 6 is characterized in that, the cycle of the second AC driving signal greater than one vertical during.
8. display device as claimed in claim 5 is characterized in that, when having selected above-mentioned second display circuit, the above-mentioned control circuit that stops to stop to above-mentioned sequential control circuit supply line voltage.
9. method for controlling display device, this display device has:
Many signal lines along a direction configuration on the substrate;
Sweep signal is supplied with successively the gate drivers of above-mentioned signal line;
Many drain signal line along the direction configuration that intersects with above-mentioned gate line;
Select above-mentioned drain signal line successively, vision signal is supplied with the drain driver of this drain signal line;
Timing control signal is supplied with the sequential control circuit of above-mentioned gate drivers or drain driver; And
Be configured to rectangular, by select from the sweep signal of above-mentioned signal line, simultaneously from the show electrode of above-mentioned drain signal line supplying video signal;
The vision signal that be configured on every above-mentioned show electrode, will import is one by one supplied with first display circuit of above-mentioned show electrode one by one;
Have corresponding to the configuration of above-mentioned show electrode, keep the holding circuit of vision signal, will the voltage corresponding supply with second display circuit of above-mentioned show electrode with the signal that this holding circuit keeps;
Select the circuit of above-mentioned first and second display circuit to select circuit; And
According to display mode switching signal from outside input, stop supply voltage supply stop control circuit, this method for controlling display device is characterised in that,
When having selected above-mentioned second display circuit, the above-mentioned control circuit that stops to stop to the allocated circuit supply line voltage that does not need work.
10. method for controlling display device as claimed in claim 9 is characterized in that, when having selected above-mentioned second display circuit, stops to the DA of display device change-over circuit supply line voltage.
11. method for controlling display device as claimed in claim 9 is characterized in that, when having selected above-mentioned second display circuit, stops control circuit and stops amplifying circuit supply line voltage to the simulating signal of amplification/display device.
12. method for controlling display device as claimed in claim 9 is characterized in that, when having selected above-mentioned second display circuit, stops control circuit and stops to above-mentioned gate drivers or drain driver supply line voltage.
13. method for controlling display device as claimed in claim 9 is characterized in that, when having selected above-mentioned second display circuit, compares when having selected above-mentioned first display circuit, makes the AC driving signal that opposite electrode is carried out anti-phase driving usefulness be long period.
14. method for controlling display device as claimed in claim 9 is characterized in that, when having selected above-mentioned second display circuit, compares with vertical synchronizing signal, makes the AC driving signal that opposite electrode is carried out anti-phase driving usefulness be long period.
15. method for controlling display device as claimed in claim 9 is characterized in that, when having selected above-mentioned second display circuit, stops control circuit and stops to above-mentioned sequential control circuit supply line voltage.
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